Managing Configuration Registers
353
Add the prefix 0x to the configuration register address. The 0x means that the
digits that follow are in hexadecimal.
Table 7.3 lists the software configuration bit meanings. Notice that bit 6 can
be used to ignore the NVRAM contents. This bit is used for password recovery,
as described in the "Recovering Passwords" section later in this chapter.
T A B L E 7 . 2
The Configuration Register Bit Numbers
Configuration
Register
2
1
0
2
Bit number
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Binary
0
0
1
0
0
0
0
1
0
0
0
0
0
0
1
0
T A B L E 7 . 3
Software Configuration Meanings
Bit
Hex
Description
03
0x00000x000F
Boot field (see Table 7.4)
6
0x0040
Ignore NVRAM contents
7
0x0080
OEM bit enabled
8
0x101
Break disabled
10
0x0400
IP broadcast with all zeros
1112
0x08000x1000
Console line speed
13
0x2000
Boot default ROM software if
network boot fails
14
0x4000
IP broadcasts do not have net
numbers
15
0x8000
Enable diagnostic messages and
ignore NVM contents
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